BEFORE YOU BEGIN
If you’re planning work in, over, under, or near a stream, you’ll likely need a permit.

The most common permit for private, stream-related projects in Montana is the 310 Joint Application, which helps protect rivers and streams from erosion and other impacts.

Before starting your application, review the information below to avoid delays or confusion.
STEP 1: Is the 310 the right permit for your project?
In most cases, yes — if you're a landowner or contractor working near a perennial stream, this is the permit you'll need.

Still unsure? Quickly review other permit types here:
What Permits Do I Need?

Otherwise, continue reading and start your 310 application below.

STEP 2: Ready to Apply?
Already familiar with the process? Log in now

New to Gilly and ready to apply?

Create an account and begin your permit application here.

What to Know Before You Apply for a 310 Permit
Montana Conservation Districts review every 310 application to make sure your project minimizes harm to the natural environment.

Here's what they’ll be looking for:


• Project Design and River Protection
Minimize erosion and sedimentation. Maintain the natural flow, shape, and habitat of the stream.

• Use of Materials
Permit reviewers will check if your construction materials and methods fit environmental standards. Hold off on purchasing materials until your permit is approved.

• Streamside Vegetation
Plans should preserve native vegetation to stabilize streambanks. Expect to limit removal, replant disturbed areas, and manage weeds during regrowth.

Aquatic Invasive Species Prevention
You’ll need to show how you’ll clean and dry equipment before working in or around water. Preventing the spread of invasive species is a critical part of approval. Click here to learn more about aquatic invasive species in Montana.
Ready to Move Forward?
If you're confident that the 310 Joint Application is the right fit for your project, you can jump straight to the application process.
Create an account and begin your permit application here.
Still unsure? No problem — use the links below to get clarity before you apply.